#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <string>
#include <sstream>

using namespace std;

signed main(){
    int n, op = 0;
    cin >> n;
    vector<int> x(n);
    vector<int> y(n);
    for(int i = 0; i < n; i++){
        cin >> x[i] >> y[i];
    }
    for(int i = 0; i < n; i++){
        for(int j = i + 1; j < n; j++){
            for(int k = j + 1; k < n; k++){
                int a = (x[i] - x[j])*(x[i] - x[j]) + (y[i] - y[j])*(y[i] - y[j]);
                int b = (x[i] - x[k])*(x[i] - x[k]) + (y[i] - y[k])*(y[i] - y[k]);
                int c = (x[j] - x[k])*(x[j] - x[k]) + (y[j] - y[k])*(y[j] - y[k]);
                if((a == b + c) || (b == a + c) || (c == a + b))
                    op++;
            }
        }
    }
    cout << op << endl;
}